what's the approx volume of 40 grams of lye crystals??

[jlinzmaier]

Looking to make a 1mole solution of NaOH. Since I don't have a scale, just wondering approx how much 40 grams of lye crystals would be in dry volume.

Thanks.

Jeremy

[James404]

I was also just wondering this. Looking to regenerate some GFO but wish there was some easy way to get these measurements of ingredients.

[jlinzmaier]

I believe Randy stated one teaspoon equaled about 40 grams in the regeneration thread but I saw a comment on an online link that indicated 40 grams was about one tablespoon. Since a tablespoon is three times the size of a teaspoon I figured I better clarify.

Jeremy

[James404]

I believe Randy stated one teaspoon equaled about 40 grams in the regeneration thread but I saw a comment on an online link that indicated 40 grams was about one tablespoon. Since a tablespoon is three times the size of a teaspoon I figured I better clarify.

Jeremy

hmm not sure if that's accurate since my bottle of "Rooto" says it has 454 grams in it, It seems like it contains more then 10 tablespoons.

[Boomer]

Guys that is hard to due without knowing at least its bulk density, which changes due to grain size. I would go with 2.13 g / cm³ ( what you find on most data sheets) = 0.2 teaspoons

40 gr / 2.13 gr = 18.779 gr x 0.2 tsp = 3.75 teaspoons = 1.25 tbs

[Bryan]

Probably better to pick up a small digital scale. Although not lab precise, going to get you a lot more closer than eyeballing. Here is an example of some on DealExtreme. Lots on Ebay as well. Pick up a calibration weight as well to test.

http://www.dealextreme.com/search.dx/search.digital%20scale

[jlinzmaier]

Guys that is hard to due without knowing at least its bulk density, which changes due to grain size. I would go with 2.13 g / cm³ ( what you find on most data sheets) = 0.2 teaspoons

40 gr / 2.13 gr = 18.779 gr x 0.2 tsp = 3.75 teaspoons = 1.25 tbs

Thank you Boomer. Didn't occur to me initially that grain size would matter but it makes perfect sense.

The regeneration process seems to be quite forgiving of the concentration of the NaOH solution so I'm going to ball park this one. I'll take your recommendation of 1.25 tbsp and call it close enough. From the regen thread people were using 0.1 mole solution all the way up to 3 mole solution. It sounds like the general concensus is that 0.5-1 mole concentration is most effective and I'm confident that your calculations with a recommendation of1.25 tbsp should get me close.

Appreciate the help Boomer!

Probably better to pick up a small digital scale. Although not lab precise, going to get you a lot more closer than eyeballing. Here is an example of some on DealExtreme. Lots on Ebay as well. Pick up a calibration weight as well to test.

http://www.dealextreme.com/search.dx/search.digital%20scale

Thanks Brian. Didn't realize the scales were so cheap. Maybe an investment for the future.

Jeremy

[bertoni]

I got a little NIST-certified scale that wasn't very expensive, and it's been very handy. The NIST certification has long since expired, but that's not critical for my uses.